private void SetBindings(QVTRelations.IRelation relation, QVTBase.IPattern pattern, EssentialOCL.CSharpOpaqueExpression cSharpOpaqueExpression, ExpressionSyntax parsedExpression)
{
ISet <string> extractedIdentifiers = CSharpParser.ExtractNonMethodIdentifiersFromExpression(parsedExpression);
foreach (string extractedIdentifier in extractedIdentifiers)
{
EssentialOCL.IVariable variable = ConstructVariable(relation, extractedIdentifier);
pattern?.BindsTo.Add(variable);
cSharpOpaqueExpression.BindsTo.Add(variable);
}
}
private EssentialOCL.IOclExpression ConstructOCLExpression(QVTRelations.IRelation relation, ExpressionSyntax parsedExpression, QVTBase.IPattern
pattern, EMOF.IType type = null)
{
// Case single identifier => OCL VariableExp
if (parsedExpression is IdentifierNameSyntax)
{
EssentialOCL.IVariable variable = ConstructVariable(relation, parsedExpression.ToString(), type);
pattern?.BindsTo.Add(variable);
return(new EssentialOCL.VariableExp()
{
ReferredVariable = variable
});
}
// Case method call => QVT RelationCallExp (if the relation exists) of function call (if the function exists)
if (parsedExpression is InvocationExpressionSyntax)
{
InvocationExpressionSyntax invocationExpressionSyntax = (InvocationExpressionSyntax)parsedExpression;
// We are only interested in direct calls
if (invocationExpressionSyntax.Expression is IdentifierNameSyntax)
{
IdentifierNameSyntax methodIdentifier = (IdentifierNameSyntax)invocationExpressionSyntax.Expression;
ArgumentListSyntax argumentList = invocationExpressionSyntax.ArgumentList;
QVTRelations.IRelation calledRelation = FindRelation((QVTRelations.IRelationalTransformation)(relation.Transformation), methodIdentifier.ToString());
QVTBase.IFunction calledFunction = FindFunction((QVTRelations.IRelationalTransformation)(relation.Transformation), methodIdentifier.ToString());
if (calledRelation != null)
{
QVTRelations.RelationCallExp call = new QVTRelations.RelationCallExp
{
ReferredRelation = calledRelation
};
if (argumentList.Arguments.Count != calledRelation.Domain.Count)
{
throw new InvalidQVTRelationsModelException("Relation " + relation.Name + ": wrong number of arguments in relation call " + calledRelation.Name);
}
foreach (ArgumentSyntax argumentSyntax in argumentList.Arguments)
{
QVTRelations.IRelationDomain correspondingDomain = (QVTRelations.IRelationDomain)calledRelation.Domain[argumentList.Arguments.IndexOf(argumentSyntax)];
ExpressionSyntax argumentExpression = argumentSyntax.Expression;
EssentialOCL.IOclExpression argumentOCLExpression = ConstructOCLExpression(relation, argumentExpression, pattern, correspondingDomain.RootVariable.Type);
call.Argument.Add(argumentOCLExpression);
}
return(call);
}
else if (calledFunction != null)
{
string methodname = methodIdentifier.ToString();
EssentialOCL.IOperationCallExp call = new EssentialOCL.OperationCallExp()
{
Type = calledFunction.Type,
ReferredOperation = calledFunction,
Name = calledFunction.Name,
};
foreach (ArgumentSyntax argumentSyntax in argumentList.Arguments)
{
ExpressionSyntax argumentExpression = argumentSyntax.Expression;
EssentialOCL.IOclExpression argumentOCLExpression = ConstructOCLExpression(relation, argumentExpression, pattern, calledFunction.Type);
call.Argument.Add(argumentOCLExpression);
}
return(call);
}
}
}
// Case assignment => Custom Assignment //TODO replace by OCL '=='? Meaning having to provide basic parts of OCL standard lib
if (parsedExpression is AssignmentExpressionSyntax)
{
AssignmentExpressionSyntax assignmentExpressionSyntax = (AssignmentExpressionSyntax)parsedExpression;
IdentifierNameSyntax leftIdentifier = (IdentifierNameSyntax)assignmentExpressionSyntax.Left;
ExpressionSyntax right = assignmentExpressionSyntax.Right;
EssentialOCL.IVariable variable = ConstructVariable(relation, leftIdentifier.ToString());
pattern?.BindsTo.Add(variable);
return(new EssentialOCL.Assignment()
{
AssignedVariable = variable,
Value = ConstructOCLExpression(relation, right, pattern)
});
}
// Any other case => Custom CSharpOpaqueExpression // TODO replace by QVT "Function" with a black box implementation?
EssentialOCL.CSharpOpaqueExpression cSharpOpaqueExpression = new EssentialOCL.CSharpOpaqueExpression()
{
Code = parsedExpression.ToString()
};
SetBindings(relation, pattern, cSharpOpaqueExpression, parsedExpression);
return(cSharpOpaqueExpression);
}
/// <summary>
/// Construct the OCLExpression corresponding to some CSharp expression included in the model.
/// Try to create pure OCL, fallback to custom CSharpExpression object if not handled.
/// </summary>
/// <param name="relation">The relation containing the expression.</param>
/// <param name="domainPattern">(optional) The domainPattern containing the expression.</param>
/// <param name="expressionString">The expression string to parse.</param>
/// <returns></returns>
private EssentialOCL.IOclExpression ConstructOCLExpression(QVTRelations.IRelation relation, string expressionString, QVTBase.IPattern pattern, EMOF.IType type)
{
// To be able to reuse existing transfos: we consider strings with single quotes as well
string expressionWithOnlyDoubleQuotes = expressionString.Replace("\'", "\"");
// We parse using Roslyn
ExpressionSyntax parsedExpression = CSharpParser.ParseExpression(expressionWithOnlyDoubleQuotes);
// And we use the expression analysis overload variant
return(ConstructOCLExpression(relation, parsedExpression, pattern, type));
}